Safety device for elevators



Jan. 26 1926.

P. WILSON SAFETY DEVICE FOR ELEVATORS Filed August; 20 1923 W/hesses INVEN TOR.

Patented Jan. 26, 1926 UNITED STATES PETER WILSON, OF SPRINGFIELD,ILLINOIS.

SAFETY nnvion Fort ELEVATORS. I

Application filed nu ustzo, i923. Serial No. e5 s,'s-39.

To all whom it may concern vators, s'uchas passenger elevators usedii-'1" office buildings and the like, or in connection with cages usedfor hoisting coal, etc;

The purposes of this invention are; First, to provide an economical andsimple means of providing protection for lift' elevators that'will bereliable and really safe. I

' A further object of my invention is' to provide a device for thepurpose -mentioned that will be easy to keep in repair and easily andquickly repaired when occasion demands it. i

A further object of my invention isto provide a device of the characterhereinaff ter mentioned that'is adapted -to work in all cases withoutfail.

The particular merit in my invention is;

to be found 'in'its simpl'eand easy operation, using the verysimplest'mean's possible for getting the most needed and unfailingaction in cases of emergency in the event of an elevator cable breaking.

The desired objects of my invention are obtained by the safety deviceforel'evators described'in the annexed specification recited in theclaims and iillustratedin the accompanying drawing in which likereference numerals indicate the samejstructural parts in the severalfigures; I I

Fig. 1 is'a perspective view o'fthe assembled parts of the safety deviceof my invention. I I I ,V

Fig. 2 1s a perspect ve view ofa section of the guide rail adapted toact as a guide for the elevator device of my inyention.

Fig. 3 is' a perspective of' the counterweiglited dog adapted tomesli'with stoplugs 3 1011 the vertical guidera-i'l shown in Fig.2. f

Fig. 4 is a perspective of the counterweight which is adapted to assistin drop ping grappling dog 2 intoines'hing relation with stoplugs'3shown in Fig. 2 in the event of sudden parting of cable supporting anelevator.

Fig. 5 is an end View of the device of my inventionin part-showing thenormally re'la of it. .This figure also shows the shapes of thestop-lugsanda section of the steel beam on which. the device of niy invention ismounted.

Fig. 6 is aside view of'the device of my invention in partshowingtlie'relative position of the grappling'dog's and the stoplugsw'ith'which it meshes.

Fig. 7 is a top view in part pling .dogs are mounted on thesteel beam ofthe elevator andsholwing also in the mean? time. the relative positionof said grappling dogs With respect to the vertical I alignment Qf theperpendicular guide rail which not only'serlves as a-guide for elevatorbut also carries integral therewith the stop-lugs or cogs of the partcular design shown which serve as stofp means for'the elevator when nthe event of the-suspending .cable'brealrngthe grappling dogsautomatically drop intcl aiqu cl: meshing engagement with said race. I II The'preferred embodiment of my invention'fis' illustrated in theseveral :figures above ment oned and the desired means :of operat-' ingthis device will bev clearly understood by carefully observing. theillustrations. when reading the instructions concerning the operationof-thisdevicez 3 I Y I Aidetailed description therefore of this devicewill be noted as follows: When it is desiredtoinstall the device of myinvention on a lift elevator perspective drawing shown (in -1 willillustrate therelative position ofthe several parts thereof. For

instance, when it is desired to assemble the several parts theengineerwill proceed as follows; First, attach brackets 24, three pairs ioffthesame in correspondingv relative positions on each of the two sides ofthe beam of theelevator. These will be attached, of course .to thevertical planeof the beam as shown. It will be noted that there is onegrapJoli-ngv dog on each side of each vertical: guide rail which carriesthe meshing stop-lugs with'which said grappling dogs are adapted tomeshon corresponding op positesides. It will be also noted that there ison the same shaft alignment with said grappling dogs a counterweight inthe middleof the space between the two end dogs that are found onthesame side of the elevato'rbeani. It "is tobe here noted that said I tiveposition ofthe grappling dogs both i when in meshing-engagement and whenout" ofth e. 1e; Vice f my invention showinghow the gimp mally operatingposition.

counterweight is adapted to be suspended from the same supporting ringon which the elevator is supported which ring is attached directly tothe cable which supports the elevator.

Character 28 Fig. 4 is a keyed tubular sleeve integral with auxiliarycounterweight 6 and adapted to hold said counter-weight in a centrallydisposed location on the counter-shaft on which it is supported.

It will be observed that as long as the elevator cable is in good shapethe grappling dogs and the counterweights are simultaneously lifted to arotatively elevated posi tion in which they are held as long as theelevator is being supported by the cable, but in the event of theelevator cable brea ing said grappling dog will quickly rotatively dropto an engaging position with rack lugs 3 on vertical guide rail madeintegral therewith.

Referring now to the detail parts of the device, numeral 1 is the baseof the vertical guide rail which acts as a guide means for an elevator.Numeral 2 is the grappling cogs of the dogs adapted to mesh with thelugs of rack 3 on the vertical guide rail. Numeral 3 shows the lugs ofthe rack with which grappling dogs mesh in an emergency. Numeral i isthe hole in the grappling dog through which horizontal shafts 7 and 8pass in mounting said dog into nor Numeral 5 is the counterweight madeintegral with said grappling dogs. Numeral 6 is also a counterweightmade integral with said counterbalance which is adapted to aid indropping said grappling dogs into meshing engagement with the stop-lugsin emergency. Numerals 7 and 8 illustrate the correspond ing horizontaloppositely mounted shafts which are supported by brackets 2a whichshafts are adapted to serve as supporting means and pivot means forrotatively mounted grappling dogs and center mounted counterweight.Numeral 9 indicates the part of the vertical guide rail which is adaptedto come in contact with the guide elements of an elevator. Numerals 10and 11 and 11 are detail parts of the elevator beam on which the deviceof my invention is mounted. Numeral 12 is the vertical plate running upand down a shaft serving as supporting means for vertical guide railabove mentioned. Numeral 13 is the partition or walling means forwalling up the shaft. Numeral 14 is the bottom plate of the beamstructure of the elevator. Numeral 15 is the eye bolt serving asattaching means for the suspending elevator cable. Numeral 16 indicatesthe position of the rectangular hole in the elevator beam plate throughwhich the meshing cogs of said grappling dogs are adapted to pass whenmoving into meshing engagement with said vertical stop-lugs. Numeral 17indicates the flank portion of said vertical guide rail. Numeral 18indicates the elevator supporting cable. Numeral 19 indicates the ringfrom which is suspended the several attaching cables which radiatetherefrom and attach to the eye bolts of the elevator by which means theelevator is suspended. Numerals 20 and 21 indicate said attachingcables. Numerals 22 and 23 are correspondingly opposite supportingcables for the rotatively mounted counter-weights and grappling dogs ofthe device of my invention. It is to be noted that these twocorresponding supporting cables just mentioned are also centrallyattached at their upper ends to the same ring to which the divergingelevator supporting cables are attached. Numeral 2a indicates thebracket which is adapted to support horizontal shafts 7 and 8 on whichare mounted the grappling dogs and counterweights above mentioned.Numeral 25 indicates the elevator frame work. Numeral 26 indicates theattaching means for connecting the frame work of the elevator to thesupporting beam thereof. Numeral 27 indicates the floor of the elevator.

It will be noted in the detail study of the details of my invention thatcertain minor details in the construction of my invention may be variedin design and still stay within the spirit and scope of my invention.

Having thus described the nature of my invention what I claim as new anduseful and desire to secure by Letters Patent 1s- 1. In a safety devicefor elevators the combination comprising a pair of opposite verticalshaft guides for theelevator; each having a plurality of verticallyaligned stoplugs, an elevator beam adapted to be guided by said verticalguidesin the vertical movable support of the elevator, parallel oppositehorizontal supporting shafts rotatably mounted through supportingcounter shaft brackets; emergency catch dogs in opposite pairs securedto the ends thereof, and adapted to rotate with said rotatablecountershaft; auxiliary mounted counter weights secured to and centrallydisposed on said rotatable counter shafts and adapted to simultaneouslyrotate with said rotatable counter shafts by action of gravity in therotating movement thereof in bringing said emergency catch dogs intoemergency engagement with said stop lugs in said elevator guides in theevent of accidental parting of the elevator supporting cable.

2. An elevator safety device of the character described comprising apair of opposite vertical shaft guides for the elevator provided withintegral vertical stop-lugs, an elevator supporting beam provided with0ppositely positioned counter shaft supporting brackets, a pair ofhorizontal parallel rotatable counter shafts rotatably mounted in saidbrackets; oppositely mounted rotatable counter-Weighted emergency catchdogs adapted to normallyengage With said vertically aligned stop-lugs bythe action of gravitation in the event of an accidental parting of thesupporting cable for the elevator; auxiliary centrally disposed counterweights securely mounted on said counter shafts and adapted .to aid inexpediting the emergency rotation of said emergency catch dogs asdescribed and for the purpose set forth.

3. In an elevator safety device of the char acter described, thecombination with, vertical guide members in the elevator shaft, havingintegral vertically aligned stop-lugs on opposite side faces thereof, ofa cage having opposite sets of counter-balanced emergency catch dogsmounted on bracket supported horizontally parallel opposite countershafts, adapted to provide simultaneous r0- tatable support of saidcatch dogs; said rota tably supported emergency catch dogs adapted to benormally suspended in a predetermined position of disengagement With theintegral vertically aligned stop-lugs,

during the cable support of said elevator; but adapted to quickly andautomatically rotate simultaneously into engagement With said stop-lugsthrough the agency of graviemergency catch dogs as described and for thepurpose set forth.

- In Witness whereof I hereunto set my hand and seal this 13th dayofAugust A. D. 1923:

PETER WILSON. [1,. s.]

